Add react and underscore to devDependencies.
Add react and underscore to devDependencies.

So the tests work out of the box.

Test plan:
    mocha --reporter spec --compilers jsx:test/compiler.js
        test/test-helper.js test/*test.jsx

Auditors: kevin

jepezi/react-components,sloria/react-components,redsunsoft/react-components,Khan/react-components,sloria/react-components,Khan/react-components,Khan/react-components,jepezi/react-components,vasanthk/react-components,redsunsoft/react-components,sloria/react-components,jepezi/react-components,quicktoolbox/react-components,quicktoolbox/react-components,quicktoolbox/react-components,vasanthk/react-components,vasanthk/react-components,redsunsoft/react-components